LfMerge: Fix again
LfMerge: Fix again

We need to source environ so that the mono environment is set
correctly. Since libfieldworks-fdo is not installed on the package
builder build agent we pass a special RUNMODE.

Change-Id: I62de79fd38ef6e26de2df28058166c94f34a78ce

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts